Online Stopwatch

Free online stopwatch with lap times: hundredths of a second, fastest and slowest laps marked, copy your laps, full screen, and it keeps counting if you reload the page or switch tabs. No sign-up.

Sound and options

When time is up

Repeat

Volume

Show the time in the browser tab Keep the screen awake while running Pop-up notification when time is up Show tenths of a second

More timers and clocks

All timers Countdown timer Stopwatch Alarm clock Pomodoro Interval timer Countdown to a date Clock Time zones

Online stopwatch

A precise online stopwatch with lap times, for running, swimming, cooking, presentations, experiments or any task you want to time. It shows hours, minutes, seconds and hundredths, and keeps counting even if you reload the page or switch tabs.

Features

Lap times with the lap time and the running total; once you have three laps the fastest and slowest are marked.
Copy your laps and paste them into a spreadsheet or a message.
Full screen for a big stopwatch on a gym or classroom screen.
The elapsed time shows in the browser tab while it runs.
Keyboard: Space starts or pauses, L records a lap, F goes full screen.

Questions

How accurate is it?

It measures from your device’s clock rather than counting ticks, so it does not drift when the tab is in the background. Button presses add a few milliseconds of human and screen delay, as with any phone stopwatch.

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